2013 Subaru Impreza WRX STI - Project Log

[AbeisAverage]

It not about cost it is about wondering how the different octanes will effect the car. Mostly mpg wise, because there are a lot of varied accounts from it works fine to only for emergencies and keep off boost. It is purely out of curiosity, and the inability to find a reliable source on the matter. Everyone seems to have their own opinion on this, but someone on here now has a new sti I was just wondering if they were going to look into it at all.

Even the difference between 91 and 93 I think would be interesting. Although I imagine it is negligible outside of computer when it comes to premiums, but that's just my guess.

[pgfpro]

I love your car!!!

I tried the 87 octane fuel on my Talon running my own maps with ECM Link management. It got to the point of making the car a total dog and defeated the purpose of owning it in the first place. So I gave up and now just run 91 octane fuel or better.

I built a a belly pan/parts and oil catcher also out of Lexan. But I can't run it during the summer month's. So I haven't recorded any stints with it yet. As soon as it cool's down i will put it back on.

[YukonCornelius]

Originally Posted by AbeisAverage

Okay finally found something, apparently in the manual it says it can run on 87 temporarily for emergencies, however it's for a 2010 wrx. I can't tell if the warning beforehand says it doesn't apply to the sti. That's what it looks like, though. Does it cost a lot of money to add knock sensing capabilities to the computer? Is it like entirely a thrown out idea because it's the sti version?

Now for an aside about the cts-V, how is rearward visibility? People always complain about how weird the back looks does it make a difference? I like the design of the rear, although, it does kind of make the car look stout. Which kind of goes with the trying to be muscle-y.

I can see everything pretty pretty well, I have a sedan. I think the visibility is an issue with the coupes and wagons.

[Awd180]

I have an 02 wrx as I stated, I have a tactrix cable that I can run diagnostics on my pc and even with 93 I receive knock on occasion. But with wear and tear it's expected, I do need a service and tune to fix my a/f but 60% of it is poor octane. I've put 87 in when I had to and burned through it fast, stayed out of boost and would have more backfire during dfco mode.

[jedi_sol]

Originally Posted by AbeisAverage

It not about cost it is about wondering how the different octanes will effect the car. Mostly mpg wise, because there are a lot of varied accounts from it works fine to only for emergencies and keep off boost. It is purely out of curiosity, and the inability to find a reliable source on the matter. Everyone seems to have their own opinion on this, but someone on here now has a new sti I was just wondering if they were going to look into it at all.

Even the difference between 91 and 93 I think would be interesting. Although I imagine it is negligible outside of computer when it comes to premiums, but that's just my guess.

Sure, I'll run maybe 1-2 gallons of 87 to test it out, but thats it!

[serialk11r]

Have you considered a gearing change? IIRC the STI has shorter 6th than the WRX's 5th. Though, Cobb Accessport would be the bigger bang for the buck, especially if you're willing to run ultra-lean (increases NOx emissions).

[jedi_sol]

Here is my manuals info on octane ratings

[jedi_sol]

Originally Posted by serialk11r

Have you considered a gearing change? IIRC the STI has shorter 6th than the WRX's 5th. Though, Cobb Accessport would be the bigger bang for the buck, especially if you're willing to run ultra-lean (increases NOx emissions).

Yes I've considered a gear swap. Is putting a wrx 5th gear as my 6th gear possible? I'm just worried it might void my factory warranty.

[Fat Charlie]

No, nobody buys one of these things to hypermile, but when you're not busy scorching the pavement you might as well. That's how I got started.

Telling a Subaru forum that you hypermile can be very entertaining.

[Smurf]

Jedi Sol said:

a lot of things tuners do to make their car faster can also apply to ecomodding (ie aero parts)


I absolutely agree, however convincing many of them is near impossible. To me, ecomodding is sport-driving in itself. Anyone can drive 90+ mph, however very few can maintain even 30+ mpg. Add in the cost of traffic tickets, insurance, and higher possibility of a traffic accident, and I'll take ecomodding over performance any day.

By the way, your grill block and foglight fills look GREAT!